your doctor may use genetic tests to determine treatment. don't stop taking plavix without talking to your doctor as your risk of heart attack or stroke may increase. people with stomach ulcers or conditions that cause bleeding should not use plavix. taking plavix alone or with some other medicines, including aspirin, may increase bleeding risk, so tell your doctor when planning surgery. tell your doctor all medicines you take, including aspirin, especially if you've had a stroke. if fever, unexplained weakness or confusion develops, tell your doctor promptly. these may be signs of ttp, a rare but potentially life-threatening condition, reported sometimes less than 2 weeks after starting plavix. other rare but serious side effects may occur. >>> and now a "world news" investigation -- johnson & johnson is one of america's most respected brands. tylenol, motrin. so why did people secretly pull one of its products off the shelves? here with our investigation, dr. richard besser. rich. >> yes, diane, for generations, parents have depended on jo